Path: chuka.playstation.co.uk!scea!peter_alau@playstation.sony.com
From: "Antony Arciuolo" <tony1@nac.net>
Newsgroups: scea.yaroze.programming.gnu_compiler
Subject: Re: Linking
Date: Fri, 3 Dec 1999 08:33:31 -0500
Organization: SCEA News Server
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References: <8275bv$jq3@scea> <38473a31.380863452@news.playstation.co.uk>
Reply-To: "Antony Arciuolo" <tony1@nac.net>
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I think BOTH should work because I got the #ifndif in there. So any 2nd
include of BG.h should be completely skipped, otherwise I'd get multiple
definitions for each and every file. but nope, just on statically init'ed
arrays.

- Tony

Steven Osman <sosman@terratron.com> wrote in message
news:38473a31.380863452@news.playstation.co.uk...
> Antony,
>
> I would recommend using something to the effect of:
>
> extern u_short Layout1[6];
> in the .h file,
>
> and putting the code you have written below in bg.c.  I am guessing
> that you #include bg.h in both main.c and bg.c, correct?
>
> The problem is that each time a .c file #includes bg.h, they will
> define a new "copy" of Layout1, hence, your error.
>
> As for your latter comment, I'm not certain why
> u_short Layout1[6];
> would work.  To me, that looks like you are still redefining it.
> Maybe it has something to do with the way the linker works/ including
> statically initialized variables, and all...?  (Still, I don't think
> EITHER should work).
>
> On Thu, 2 Dec 1999 20:26:11 -0500, "Antony Arciuolo"
> <antony.arciuolo@mail.trincoll.edu> wrote:
>
> >I have an array to describe a layout (index) for a GsBG.
> >
> >I want to explicitly define it in the header of a BG module:
> >
> >#ifndef BG_H
> >#define BG_H
> >
> >u_short Layout1[] =
>

> >GsCELLtransparentCell, GsCELLtransparentCell,
> >GsCELLtransparentCell, GsCELLtransparentCell,
> >GsCELLtransparentCell, GsCELLtransparentCell
> >};
> >
> >...
> >#endif
> >
> >Now I want to compile using this makefile
> >
> >
> >PROGRAM = test.pxe
> >PXE_ADDR = 80140000
> >
> ># To Optimize use -O3 instead of -g
> >OPTIONS = -c -g
> >LINKER = -Xlinker -Map -Xlinker mapfile.map -Xlinker -Ttext -Xlinker
$(PXE_ADDR)
> >DEPENDENCIES = bg.o main.o
> >
> >all: $(PROGRAM)
> >
> >$(PROGRAM): $(PROGOBJ) $(DEPENDENCIES)
> > gcc $(LINKER) $(DEPENDENCIES) -o $(PROGRAM)
> >
> >main.o: main.c mainTIMS.h Levels.h
> > gcc $(OPTIONS) main.c
> >
> >bg.o: bg.c bg.h Levels.h
> > gcc $(OPTIONS) bg.c
> >
> >The problem is:
> >
> >gcc -Xlinker -Map -Xlinker mapfile.map -Xlinker -Ttext -Xlinker 80140000
bg.o main.o -o test.pxe
> >main.o(.data+0x0): multiple definition of `Layout1'
> >bg.o(.data+0x0): first defined here
> >make.exe: *** [test.pxe] Error 1
> >
> >How can I solve this? It just does not seem to me that it is being
defined twice, and if I redeclare Layout1 as:
> >
> >
> >u_short Layout1[6];
> >
> >Everything is fine. Why?
> >
> >- Tony
> >
> >
> >
> >
>